Contract Assets and Liabilities

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Contract Assets and Liabilities

Revenue

We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Environmental Solutions
Product sales	$	22,940	$	28,995	$	66,101	$	76,397
Construction contracts	21,590		16,841		51,784		63,048
Services	1,270		177		2,442		1,901
Total Environmental Solutions	45,800		46,013		120,327		141,346
Maintenance and Technical Services
Services	72,915		75,100		296,164		263,961
Total Maintenance and Technical Services	72,915		75,100		296,164		263,961
Total revenue	$	118,715	$	121,113	$	416,491	$	405,307

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Environmental Solutions
United States	$	45,729	$	46,013	$	119,410	$	141,346
Foreign	71		—		917		—
Total Environmental Solutions	45,800		46,013		120,327		141,346
Maintenance and Technical Services
United States	72,915		75,100		296,164		263,961
Total Maintenance and Technical Services	72,915		75,100		296,164		263,961
Total revenue	$	118,715	$	121,113	$	416,491	$	405,307

As of September 30, 2020, the Company had remaining performance obligations with an aggregate transactions price of $138,796 on construction contracts for which we recognize revenue over time. We expect to recognize approximately 16% of our remaining performance obligations as revenue during the remainder of 2020, 32% in 2021, 17% in 2022, and 35% thereafter. Revenue associated with our remaining performance obligations includes performance obligations related to our construction contracts. The balance of remaining performance obligations does not include variable consideration that was determined to be constrained as of September 30, 2020. As of September 30, 2020, we included unapproved change orders associated with project scope changes of $2,459 in determining the profit or loss on certain construction contracts. Change orders of $909 were approved subsequent to quarter-end.

Contract Assets and Liabilities

The timing of revenue recognition, billings and cash collections results in accounts receivable, contract assets, and contract liabilities on the unaudited condensed consolidated balance sheets.

Our contract assets are as follows:

	September 30, 2020		December 31, 2019
Costs and estimated earnings in excess of billings	$	12,828	$	19,256
Retainage	4,388		1,385
Total contract assets	$	17,216	$	20,641

Our contract liabilities are as follows:

	September 30, 2020		December 31, 2019
Deferred revenue	$	826	$	505
Billings in excess of costs and estimated earnings	11,235		77
Total contract liabilities	$	12,061	$	582

We recognized revenue of $159 and $582 for the three and nine months ended September 30, 2020, respectively, that was previously included in contract liabilities at December 31, 2019. The increase in contract liabilities was primarily due to an increase in billings in excess of costs and estimated earnings associated with billings during the three and nine months ended September 30, 2020 for a specific remediation and compliance project.

Costs and estimated earnings on uncompleted contracts are as follows:

	September 30, 2020		December 31, 2019
Costs incurred on uncompleted contracts	$	110,624	$	65,343
Estimated earnings	15,221		9,618
Total costs and estimated earnings	125,845		74,961
Less billings to date	(124,252)		(55,782)
Costs and estimated earnings in excess of billings	$	1,593	$	19,179

    The net balance in process classified on the unaudited condensed consolidated balance sheets is as follows: 

	September 30, 2020		December 31, 2019
Costs and estimated earnings in excess of billings	$	12,828	$	19,256
Billings in excess of costs and estimated earnings	(11,235)		(77)
Net balance in process	$	1,593	$	19,179

Anticipated losses on long-term contracts are recognized when such losses become evident. As of September 30, 2020 and December 31, 2019, accruals for anticipated losses on long-term contracts were $189 and $322, respectively.